v0.5.0

• Refactored the publish and unpublish management commands to use boto instead of s3cmd.
• build and publish management commands use file mimetypes instead of a regex on the filename to decide if a file will be gzipped.
• publish management command includes --force and --dry-run uploads to force an upload of all file, regardless of changes, and to print output without uploading files, respectively.
• publish management command now pools uploads to increase speed